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(a) Ac2O, EtCO2H, 20 °C, 10 h, 83%; (b) TsCl, pyridine, Et3N, 4 °C, 10 h, 65% (60); (c) DMF, K2CO3, BrCH2CH2CH(OCH2)2, 80 °C, 3 h, 72%; (d) H2SO4, 1 h, 40%; (e) AcOH, CH2 = CHCH2CH(OC2H5)2, reflux, 3 h; (f) DDQ, AcOH, 100 °C, 15 min.; (g) 4 M HCl, 80 °C, 1 h, 40% (e,f,g).
